[Python-Dev] Backporting PEP 3127 to trunk

[Guido van Rossum]

I wonder if, in order to change the behavior of various built-in
functions, it wouldn't be easier to be able to write

from future_builtins import oct, hex  # and who knows what else

Agreed with your approach for bin().

On Thu, Feb 21, 2008 at 2:26 PM, Eric Smith
<eric+python-dev at trueblade.com> wrote:
> I'm going to work on backporting PEP 3127, specifically the hex, oct(),
>  and bin() builtins.  I have bin() completed, and I'll check it in
>  shortly.  oct() will require a future import.  Does anyone have any
>  pointers for implementing this?  I understand (and have completed)
>  adding the future import, but what I don't understand is how to modify
>  the behavior of oct() for only the module where the future import is
>  execute.  Any rough ideas or pointers to existing code that does
>  something similar would be helpful.  I also need a name for the future
>  import statement.
>
>  Also, I notice in py3k that __hex__ and __oct__ have vanished, and
>  instead hex() and oct() just uses the __index__ machinery to produce a
>  number, then converts that to a string.  So I'm thinking that maybe we
>  could use the same future import statement that controls oct()'s
>  behavior to also switch hex() and oct() to the py3k behavior.  Or, maybe
>  we should use a different future import?  Or, I guess, not do this at
>  all.  But I think it's a good idea.
>
>  I guess another issue is changing hex()'s behavior of adding a trailing
>  L for longs.  I don't really see the value in this, and maybe it should
>  also change with a future import statement.
>
>  For bin(), I just used the py3k behavior, and didn't implement a __bin__
>  method.  I'm also not adding a trailing L for longs.  I think that makes
>  the most sense.
>
>  Eric.
>
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-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)